Designers should take care not to inadvertently create climbing aids to upper windows and flat roofs via structures such as boundary walls and external staircases. It is hoped that external
staircases for new industrial units and warehouses will be avoided.

Automatic building ventilation control systems are located at high level to reduce opportunities for criminal attack. Where particularly vulnerable they can be protected by internal grille. It is recommended that an automatic opening window or vent system incorporates a fail-safe mechanism to notify building management that a window or vent has failed to close.

External rainwater pipes can be used for climbing and should be either square or rectangular
in section, flush fitted against the wall or contained within a wall cavity or covered recess. Bends in pipes and horizontal runs are minimised. They should be of fire resistant material.

Building lines are clear and lack deep recesses and thus opportunities for crimes such as
graffiti, burglary and arson as well as inappropriate loitering are also reduced. Where recessed
door are necessary for emergency egress onto a public highway they should be a maximum of
600mm deep or the adjacent area protected by bollards or railings.